I just love this thread! I'm such a fan of mustard, and have done mustard research over the years. I'd like to find a mustard festival!
My favorite brand of mustard is Woebers which comes from Ohio Amish country. Their "reserve" stock of the whole seed mustard (in a jar) is my favorite. I actually wrote to them one time telling them what a fan I am of their "reserve" varieties, and they wrote back and even sent me a couple of cases of the stuff!